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1/*
2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
4 *
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Send feedback to <lxie@us.ibm.com>
23 *
24 */
25#include <linux/pci.h>
26#include <linux/string.h>
27
28#include <asm/pci-bridge.h>
29#include <asm/rtas.h>
30#include <asm/machdep.h>
31
32#include "../pci.h" /* for pci_add_new_bus */
33#include "rpaphp.h"
34
35int rpaphp_get_sensor_state(struct slot *slot, int *state)
36{
37 int rc;
38 int setlevel;
39
40 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
41
42 if (rc < 0) {
43 if (rc == -EFAULT || rc == -EEXIST) {
44 dbg("%s: slot must be power up to get sensor-state\n",
45 __func__);
46
47 /* some slots have to be powered up
48 * before get-sensor will succeed.
49 */
50 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
51 &setlevel);
52 if (rc < 0) {
53 dbg("%s: power on slot[%s] failed rc=%d.\n",
54 __func__, slot->name, rc);
55 } else {
56 rc = rtas_get_sensor(DR_ENTITY_SENSE,
57 slot->index, state);
58 }
59 } else if (rc == -ENODEV)
60 info("%s: slot is unusable\n", __func__);
61 else
62 err("%s failed to get sensor state\n", __func__);
63 }
64 return rc;
65}
66
67/**
68 * rpaphp_enable_slot - record slot state, config pci device
69 * @slot: target &slot
70 *
71 * Initialize values in the slot, and the hotplug_slot info
72 * structures to indicate if there is a pci card plugged into
73 * the slot. If the slot is not empty, run the pcibios routine
74 * to get pcibios stuff correctly set up.
75 */
76int rpaphp_enable_slot(struct slot *slot)
77{
78 int rc, level, state;
79 struct pci_bus *bus;
80 struct hotplug_slot_info *info = slot->hotplug_slot->info;
81
82 info->adapter_status = NOT_VALID;
83 slot->state = EMPTY;
84
85 /* Find out if the power is turned on for the slot */
86 rc = rtas_get_power_level(slot->power_domain, &level);
87 if (rc)
88 return rc;
89 info->power_status = level;
90
91 /* Figure out if there is an adapter in the slot */
92 rc = rpaphp_get_sensor_state(slot, &state);
93 if (rc)
94 return rc;
95
96 bus = pcibios_find_pci_bus(slot->dn);
97 if (!bus) {
98 err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name);
99 return -EINVAL;
100 }
101
102 info->adapter_status = EMPTY;
103 slot->bus = bus;
104 slot->pci_devs = &bus->devices;
105
106 /* if there's an adapter in the slot, go add the pci devices */
107 if (state == PRESENT) {
108 info->adapter_status = NOT_CONFIGURED;
109 slot->state = NOT_CONFIGURED;
110
111 /* non-empty slot has to have child */
112 if (!slot->dn->child) {
113 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
114 __func__, slot->name);
115 return -EINVAL;
116 }
117
118 if (list_empty(&bus->devices))
119 pcibios_add_pci_devices(bus);
120
121 if (!list_empty(&bus->devices)) {
122 info->adapter_status = CONFIGURED;
123 slot->state = CONFIGURED;
124 }
125
126 if (rpaphp_debug) {
127 struct pci_dev *dev;
128 dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name);
129 list_for_each_entry (dev, &bus->devices, bus_list)
130 dbg("\t%s\n", pci_name(dev));
131 }
132 }
133
134 return 0;
135}
136
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/of.h>
12#include <linux/pci.h>
13#include <linux/string.h>
14
15#include <asm/pci-bridge.h>
16#include <asm/rtas.h>
17#include <asm/machdep.h>
18
19#include "../pci.h" /* for pci_add_new_bus */
20#include "rpaphp.h"
21
22int rpaphp_get_sensor_state(struct slot *slot, int *state)
23{
24 int rc;
25 int setlevel;
26
27 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
28
29 if (rc < 0) {
30 if (rc == -EFAULT || rc == -EEXIST) {
31 dbg("%s: slot must be power up to get sensor-state\n",
32 __func__);
33
34 /* some slots have to be powered up
35 * before get-sensor will succeed.
36 */
37 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
38 &setlevel);
39 if (rc < 0) {
40 dbg("%s: power on slot[%s] failed rc=%d.\n",
41 __func__, slot->name, rc);
42 } else {
43 rc = rtas_get_sensor(DR_ENTITY_SENSE,
44 slot->index, state);
45 }
46 } else if (rc == -ENODEV)
47 info("%s: slot is unusable\n", __func__);
48 else
49 err("%s failed to get sensor state\n", __func__);
50 }
51 return rc;
52}
53
54/**
55 * rpaphp_enable_slot - record slot state, config pci device
56 * @slot: target &slot
57 *
58 * Initialize values in the slot structure to indicate if there is a pci card
59 * plugged into the slot. If the slot is not empty, run the pcibios routine
60 * to get pcibios stuff correctly set up.
61 */
62int rpaphp_enable_slot(struct slot *slot)
63{
64 int rc, level, state;
65 struct pci_bus *bus;
66
67 slot->state = EMPTY;
68
69 /* Find out if the power is turned on for the slot */
70 rc = rtas_get_power_level(slot->power_domain, &level);
71 if (rc)
72 return rc;
73
74 /* Figure out if there is an adapter in the slot */
75 rc = rpaphp_get_sensor_state(slot, &state);
76 if (rc)
77 return rc;
78
79 bus = pci_find_bus_by_node(slot->dn);
80 if (!bus) {
81 err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
82 return -EINVAL;
83 }
84
85 slot->bus = bus;
86 slot->pci_devs = &bus->devices;
87
88 /* if there's an adapter in the slot, go add the pci devices */
89 if (state == PRESENT) {
90 slot->state = NOT_CONFIGURED;
91
92 /* non-empty slot has to have child */
93 if (!slot->dn->child) {
94 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
95 __func__, slot->name);
96 return -EINVAL;
97 }
98
99 if (list_empty(&bus->devices)) {
100 pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
101 pci_hp_add_devices(bus);
102 }
103
104 if (!list_empty(&bus->devices)) {
105 slot->state = CONFIGURED;
106 }
107
108 if (rpaphp_debug) {
109 struct pci_dev *dev;
110 dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
111 list_for_each_entry(dev, &bus->devices, bus_list)
112 dbg("\t%s\n", pci_name(dev));
113 }
114 }
115
116 return 0;
117}